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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62ee7fa3dbf8f2529143b85b17b3748b2839c0817c033ad41b7f720627279d88' 
  AND token = 'ANJENb6l9cTE2g+VevAq+uN89DGYzO0DgjV5Cm8V3q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}